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H. E. TABER.

BURGLAR ALARM.

(Model.)

No. 297,311. Patented Apr. 22, 1884.

f m v m modification of the same.

UNtren Starts PATENT Utmost,

HENRY E. TABER, or WATKINS, NEW YORK.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 297,311, dated April22, 1884.

Application filed December 18, 1883.

To all whom it may concern.-

Be it known that I, HENRY E. TABER, of Watkins, in the county of Schuyler, in the State of New York, have invented new and useful Improvements in Burglar-Alarms, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of burglar-alarms in which the alarm mechanism is arranged inside of a resonant door-knob,which serves the function of a bell; and the invention consists in certain novel features of the details of said burglar-alarm, all as hereinafter more fully described, and specifically set forth in the claims.

The invention is fully illustrated in the annexed drawings, in which Figure l is an edge view of that portion of a door to which my invention is applied. Fig. 2 is a rear face view of the resonant knob with the detent and stop connected therewith. Fig. 3 illustrates a Figs. 4 and 5 are transverse sections of the knob, taken parallel to the plane thereof, and showing the alarm mechanism from the rear and front, respectively; and Fig. 6 is a transverse section taken parallel to the axes of the knob.

Similar letters of reference indicate corresponding parts.

A represents the resonant knob, in the form of a hollow metallic case, which serves the function of a. bell, and is provided on one side with a shank, B, by which it is attached to the spindle S of the lock in the usual manner, the opposite side of said case being provided with a removable cap or cover, 0. In the interior of the knob A is arranged the alarm mechanism, in the form of an ordinary springactuated clock-work, consisting of a post, a, pivoted on a frame, I), and having wound upon it a spring, 8, one end of which is attached to the sustaining-frame b. The post a protrudes through the cover 0, and has its extremity adapted for the application of a key by which to wind up the spring. A spur-wheel, c, is mounted movably on the post, and receives its motion from the spring by means of a ratchetwheel. d, fixed to the post, and a pawl, 0, connected with the spur-wheel and engaging the (ModeL) the escapement-wl1eel,which imparts an oscillatory movement to the verge h. To the rockshaft 13 is also attached the bell-hammer Z, which thus receives a vibratory movement, by which it is caused to strike the shell of the knob constituting the alarm-bell. The rockshaft 6 protrudes through the rear wall of the knob A, and to the outer end thereof is attached a detent, m, in the form of a small 1e- Ver or crank.

On the exterior of the knob A, preferably between the knob and door, is arranged a stationary stop, T, which is adapted to actuate the detent m, so that when the k nob is in its normal or dormant position said detent is caused to hold the verge hstationary in its engagement with the escapement-wheel g, and thus prevent rotation of the same, and consequently stop the movement of the entire alarm mechanism. In turning the knob A to open the door, the detent m becomes released from the stop T, and allows the alarm mechanism to operate and sound the alarm-bell A,inclosing the same. It is obvious that the knob A, which constitutes the alarm-bell, must be arranged on the inner side of the door. WVherc the knob A is to be permanently attached, I prefer to form the stop '1. of a plate hinged on the escutcheon, as represented in Fig. l ofthe drawings; but in case the knob is intended for use by travelers, and designed'to be temporarily attached to the door, I construct the stop '1" in the form of a weighted arm hung on the shank B of the knob, and held in engagement with the detent by the gravity of said arm, as illustrated by dotted lines in Fig. 1 and in full lines in Fig. 3 of the drawings.

N designates a supplemental stop hinged on the knob A, and adapted to be swung under the detent m, as illustrated by dotted lines in Fig. 2 of the drawings, and hold the same so as to stop the alarm mechanism while said knob is detached from the door.

I do not claim, broadly, the combination of the alarm mechanism with a hollow resonant door-knob inclosing said mechanism, as I am awarethe same is not new; but

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with the hollow resonant door-knob and spring-actuated clock-work inclosed therein, the bell-hammer connected to the verge-shaft i, the external detent, m, connected to the protruding end of said shaft, and the hinged stop '1, adapted to be thrown in and out of position for engaging the detent when the knob is in its normal position, substantially as described and shown.

this 3d day of December, 1883.

HENRY E. TABER. [L. s.]

Witnesses:

FREDERICK H. GIBBs,

n. 0. RAYMOND. 

